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Derivative Instruments - Fair Value of Derivative Instruments (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Derivative [Line Items]    
Total Current Assets $ 84,657 $ 247,794
Total Other Non-Current Assets 188,237 314,096
Total Current Liabilities 42,329 41,466
Total Non-Current Liabilities 127,290 115,862
Commodity Swaps    
Derivative [Line Items]    
Total Current Assets 53,668 234,238
Total Other Non-Current Assets 134,661 288,543
Total Current Liabilities 23,506 345
Total Non-Current Liabilities 59,388 9,693
Basis Only Swaps    
Derivative [Line Items]    
Total Current Assets 30,848 13,556
Total Other Non-Current Assets 52,903 25,553
Total Current Liabilities 14,491 40,626
Total Non-Current Liabilities 57,150 105,445
Interest Rate Swaps    
Derivative [Line Items]    
Total Current Assets 141 0
Total Other Non-Current Assets 673 0
Total Current Liabilities 4,332 495
Total Non-Current Liabilities $ 10,752 $ 724